Water heater control method

Abstract

The present invention provides a control method for a water heater, the control method comprising: obtaining a target water outlet temperature; obtaining a hot water flow rate detected by a hot water flow sensor, a cold water flow rate detected by a cold water flow sensor, and a cold water temperature detected by a cold water temperature sensor; calculating the hot water target temperature according to the law of conservation of heat based on the target water outlet temperature, the hot water flow rate, the cold water flow rate, the cold water temperature, and a hot water correction coefficient and a cold water correction coefficient; wherein the hot water correction coefficient and the cold water correction coefficient are determined based on two different sets of measurement data; and controlling a heat exchanger according to the hot water target temperature and the current hot water temperature detected by the hot water temperature sensor so that the hot water temperature is equal to the hot water target temperature. The present invention enables the water outlet from the faucet to be maintained at a constant temperature desired by the user without the user having to manually adjust the faucet, thereby reducing time consumption for adjusting the water temperature, saving water, simplifying operation, and improving user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a control method for a water heater. Background Art

[0002] Currently, the temperature set on the operator of a gas water heater is the outlet temperature of the hot water after the cold water undergoes combustion and heat exchange. However, the outlet temperature of the water at the user's tap requires the user to manually adjust the mixing ratio (angle) of the tap to achieve the user's target outlet temperature. Existing gas water heaters have the following two disadvantages:

[0003] (1) It takes a lot of time for users to manually adjust the faucet and wastes a lot of water.

[0004] (2) When users use water at different times, they have to manually adjust the faucet each time, which is cumbersome to operate and difficult to adjust to the same angle as last time, resulting in a poor user experience. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a control method for a water heater in order to overcome the defects of the prior art in which the water outlet temperature is adjusted by adjusting the faucet, which is time-consuming, wastes water, is cumbersome to operate, and has a poor user experience.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a control method for a water heater, wherein the water heater includes a heat exchanger, a hot water flow sensor, a hot water temperature sensor, a cold water flow sensor, and a cold water temperature sensor, wherein the water outlet of the heat exchanger is connected to the hot water inlet of an external faucet, the hot water flow sensor is arranged at the water inlet of the heat exchanger, the hot water temperature sensor is arranged at the water outlet of the heat exchanger, and the cold water flow sensor and the cold water temperature sensor are arranged at the cold water inlet of the faucet;

[0008] The control method includes:

[0009] Get the target water outlet temperature;

[0010] obtaining the hot water flow rate detected by the hot water flow sensor, the cold water flow rate detected by the cold water flow sensor, and the cold water temperature detected by the cold water temperature sensor;

[0011] The hot water target temperature is calculated according to the target outlet water temperature, the hot water flow rate, the cold water flow rate, the cold water temperature, and the hot water correction coefficient and the cold water correction coefficient in accordance with the law of conservation of heat; wherein the hot water correction coefficient and the cold water correction coefficient are determined based on two different sets of measurement data;

[0012] The heat exchanger is controlled according to the hot water target temperature and the current hot water temperature detected by the hot water temperature sensor so that the hot water temperature is equal to the hot water target temperature.

[0013] Preferably, obtaining the target outlet water temperature includes:

[0014] Get warm water setting instructions;

[0015] According to the warm water outlet setting instruction, the working mode of the water heater is set to the warm water outlet mode, and the target water outlet temperature is set.

[0016] Preferably, the warm water outlet setting instruction includes a set temperature value input by the user;

[0017] The setting of the target outlet water temperature includes:

[0018] The target outlet water temperature is set as the set temperature value.

[0019] Preferably, the control method further includes:

[0020] Determining whether the water mixing state of the faucet has changed;

[0021] If so, the hot water target temperature is recalculated.

[0022] Preferably, the determining whether the water mixing state of the faucet has changed includes:

[0023] It is determined whether the change in the hot water flow rate is greater than a flow rate threshold.

[0024] Preferably, the determining whether the water mixing state of the faucet has changed includes:

[0025] It is determined whether the change in the hot water flow is greater than a flow threshold and whether the time duration for which the change is maintained is greater than a time duration threshold.

[0026] Preferably, the hot water target temperature is calculated using the following formula:

[0027] TM=((Q1+Q2)*T3-A2*Q2*T2) / Q1*A1;

[0028] Wherein, TM represents the hot water target temperature, A1 represents the hot water correction coefficient, A2 represents the cold water correction coefficient, Q1 represents the hot water flow rate, Q2 represents the cold water flow rate, T2 represents the cold water temperature, and T3 represents the target water outlet temperature.

[0029] Preferably, the control method further includes:

[0030] Get the correction coefficient measurement instruction;

[0031] According to the correction coefficient determination instruction, the working mode of the water heater is set to a correction coefficient determination mode;

[0032] Obtaining two sets of measurement data with different set hot water temperatures and the same measured water outlet temperature; wherein the measured water outlet temperature represents the detected temperature of the water outlet from the faucet, and the set hot water temperature represents the target value of the hot water temperature set by the user, and each set of measurement data includes: the hot water flow rate, the hot water temperature, the cold water flow rate, and the cold water temperature;

[0033] The hot water correction coefficient and the cold water correction coefficient are calculated based on the outlet water measurement temperature and the two sets of measurement data.

[0034] Preferably, the hot water correction coefficient and the cold water correction coefficient are calculated using the following formula:

[0035] A1=(Q11*Q22*T22+Q21*Q22*T22-Q12*Q21*T21-Q22*Q21*T21)*TA /

[0036] (Q11*T11*Q22*T22-Q12*T12*Q21*T21);

[0037] A2=(Q11*Q12*T12+Q21*Q12*T12-Q12*Q11*T11-Q22*Q11*T11)*TA /

[0038] (Q21*T21*Q12*T12-Q22*T22*Q11*T11);

[0039] Among them, A1 represents the hot water correction coefficient, A2 represents the cold water correction coefficient, TA represents the outlet water measurement temperature, Q1 represents the hot water flow rate, T1 represents the hot water temperature, Q2 represents the cold water flow rate, T2 represents the cold water temperature, Q11, T11, Q21 and T21 respectively represent the hot water flow rate, hot water temperature, cold water flow rate and cold water temperature in one set of the measurement data, and Q12, T12, Q22 and T22 respectively represent the hot water flow rate, hot water temperature, cold water flow rate and cold water temperature in another set of the measurement data.

[0040] Preferably, the control method further includes:

[0041] Exit the current operating mode of the water heater.

[0042] The positive progress effect of the present invention is that: the hot water flow, cold water flow and cold water temperature related to the hot and cold water inlets of the faucet are respectively obtained through several sensors, and then combined with the target water outlet temperature and the hot water correction coefficient and the cold water correction coefficient determined based on two different sets of measurement data, the hot water target temperature is calculated according to the law of conservation of heat, and then the heat exchanger is controlled so that the current hot water temperature detected by the hot water temperature sensor is equal to the hot water target temperature, so that the water outlet of the faucet can be maintained at the constant temperature expected by the user without the need for the user to manually adjust the faucet. Since the hot water correction coefficient and the cold water correction coefficient are related to the thickness of the water pipe, water quality, etc., the corresponding hot water correction coefficient and cold water correction coefficient are different after each water heater is installed. The measurement data obtained by actual measurement ensures the accuracy of the determined hot water correction coefficient and cold water correction coefficient, thereby ensuring the accuracy of the hot water target temperature, so that the water outlet temperature of the faucet meets the user's expectations, takes less time to adjust the water temperature, saves water, is simple to operate, and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a structural diagram of an example of a water heater in a water heater control method according to a preferred embodiment of the present invention.

[0044] Figure 2 Flowchart of a water heater control method according to a preferred embodiment of the present invention.

[0045] Figure 3 Flowchart of a specific implementation of step S11 in the water heater control method according to a preferred embodiment of the present invention.

[0046] Figure 4 The figure is a flow chart of a specific implementation of a water heater control method according to a preferred embodiment of the present invention.

[0047] Figure 5 This is a flow chart of another specific implementation of the water heater control method according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention is further described below by way of preferred embodiments, but the present invention is not limited to the scope of the embodiments.

[0049] This embodiment provides a method for controlling a water heater. Figure 1A structural diagram of an example of a water heater is shown, which includes a heat exchanger A, a hot water flow sensor B, a hot water temperature sensor C, a cold water flow sensor D and a cold water temperature sensor E. The water outlet of the heat exchanger is connected to the hot water inlet of an external faucet, the hot water flow sensor is arranged at the water inlet of the heat exchanger, the hot water temperature sensor is arranged at the water outlet of the heat exchanger, and the cold water flow sensor and the cold water temperature sensor are arranged at the cold water inlet of the faucet.

[0050] Reference Figure 2 , control methods include:

[0051] S11. Obtain target outlet water temperature.

[0052] S12. Obtain the hot water flow detected by the hot water flow sensor, the cold water flow detected by the cold water flow sensor, and the cold water temperature detected by the cold water temperature sensor.

[0053] S13. Calculate the hot water target temperature according to the law of conservation of heat based on the target outlet water temperature, hot water flow rate, cold water flow rate, cold water temperature, and the hot water correction coefficient and the cold water correction coefficient. The hot water correction coefficient and the cold water correction coefficient are determined based on two different sets of measurement data.

[0054] S14: Control the heat exchanger according to the hot water target temperature and the current hot water temperature detected by the hot water temperature sensor, so that the hot water temperature is equal to the hot water target temperature.

[0055] The hot water flow sensor can also be placed at the water outlet of the heat exchanger. Since the heat exchanger uses only one outlet to provide heated hot water to the faucet, and there is only one heating circuit (pipeline) between the water inlet and outlet, the flow rate measured by the hot water flow sensor can be regarded as the hot water flow delivered to the faucet by the heat exchanger, regardless of where the hot water flow sensor is placed in the heating circuit.

[0056] The hot water correction coefficient and the cold water correction coefficient are related to the thickness of the water pipe, water quality, etc. The hot water correction coefficient and the cold water correction coefficient corresponding to each water heater are different after installation.

[0057] Assume that TM represents the target hot water temperature, A1 represents the hot water correction coefficient, A2 represents the cold water correction coefficient, Q1 represents the hot water flow rate, Q2 represents the cold water flow rate, Q3 represents the water flow rate of the faucet, T1 represents the hot water temperature, T2 represents the cold water temperature, and T3 represents the target water outlet temperature (i.e., the target water outlet temperature of the faucet). Then, when the hot water temperature is maintained at the target hot water temperature (i.e., T1 = TM), according to the law of conservation of heat, we can obtain: Q3*T3 = A1*Q1*T1 + A2*Q2*T2.

[0058] Since the water outflow of the faucet is equal to the sum of the hot and cold water inflow of the faucet, we can get: Q3 = Q1 + Q2.

[0059] From the above calculation formula, it can be calculated that: TM=((Q1+Q2)*T3-A2*Q2*T2) / Q1*A1.

[0060] Controlling the heat exchanger in a gas water heater means controlling the heating state of the heat exchanger caused by gas combustion.

[0061] In this embodiment, a number of sensors are used to obtain the hot water flow rate, cold water flow rate and cold water temperature related to the hot and cold water inlet of the faucet respectively, and then combined with the target water outlet temperature and the hot water correction coefficient and cold water correction coefficient determined based on two different sets of measurement data, the hot water target temperature is calculated according to the law of conservation of heat, and then the heat exchanger is controlled so that the current hot water temperature detected by the hot water temperature sensor is equal to the hot water target temperature, so that the water outlet of the faucet can be maintained at the constant temperature expected by the user without the need for the user to manually adjust the faucet. Since the hot water correction coefficient and the cold water correction coefficient are related to the thickness of the water pipe, water quality, etc., the corresponding hot water correction coefficient and cold water correction coefficient are different after each water heater is installed. The measurement data obtained by actual measurement ensures the accuracy of the determined hot water correction coefficient and cold water correction coefficient, thereby ensuring the accuracy of the hot water target temperature, so that the water outlet temperature of the faucet meets the user's expectations, the water temperature is adjusted in a less time-consuming manner, water is saved, the operation is simple, and the user experience is improved.

[0062] When implementing it, refer to Figure 3 , step S11 includes:

[0063] S111. Obtain warm water setting instructions.

[0064] S112. According to the warm water outlet setting instruction, the working mode of the water heater is set to the warm water outlet mode, and the target water outlet temperature is set.

[0065] The user's operation can trigger the warm water setting instruction. The user can enter the desired set temperature value on the water heater's operator (operation panel), and the target water outlet temperature can be determined based on the set temperature value. The user can also enter the desired temperature level on the water heater's operator (operation panel), and the target water outlet temperature can be determined based on the temperature level.

[0066] In this embodiment, the target outlet water temperature can be determined through the warm outlet water setting instruction, and the relevant settings of the warm outlet water mode can be triggered.

[0067] During specific implementation, the warm water outlet setting instruction includes a set temperature value input by the user.

[0068] In step S112, "setting the target outlet water temperature" includes:

[0069] Set the target outlet water temperature to the set temperature value.

[0070] In this embodiment, when the user inputs a desired set temperature value, the warm water outlet setting instruction will include the set temperature value, and the target water outlet temperature should be the same as the set temperature value.

[0071] When implementing it, refer to Figure 4 , the control method further includes:

[0072] S15: Determine whether the water mixing state of the faucet has changed.

[0073] S16: If yes, recalculate the hot water target temperature.

[0074] A change in the faucet's mixed water state indicates that the user has adjusted the faucet's angle, causing a change in the amount of hot and cold water flowing into the faucet. If the previous target hot water temperature is used, the resulting water temperature will no longer be the user's desired temperature. Therefore, in this case, the target hot water temperature must be recalculated to maintain the desired constant temperature.

[0075] After recalculating the hot water target temperature, the heat exchanger is controlled according to the hot water target temperature and the current hot water temperature detected by the hot water temperature sensor to make the hot water temperature equal to the hot water target temperature, thereby maintaining the water outlet temperature of the faucet at the constant temperature expected by the user.

[0076] In this embodiment, after the user adjusts the angle of the faucet, the hot water target temperature is recalculated and the water outlet temperature of the faucet is automatically adjusted, so that the water outlet temperature of the faucet can always be maintained at a constant temperature desired by the user. Adjusting the water temperature takes less time, saves water, is simple to operate, and improves the user experience.

[0077] In specific implementation, step S15 includes:

[0078] Determine whether the change in hot water flow is greater than a flow threshold.

[0079] Generally speaking, when the faucet angle changes, both the hot and cold water flow rates change in tandem. Changes in either the hot or cold water flow rate can be used to determine whether the faucet's mixed water state has changed. You can select either flow rate to determine whether the faucet's mixed water state has changed, as needed.

[0080] In this embodiment, a specific implementation method for determining whether the water mixing state of the faucet has changed is provided.

[0081] In specific implementation, step S15 includes:

[0082] Determine whether the change in hot water flow is greater than a flow threshold and whether the duration of the change is greater than a duration threshold.

[0083] Generally speaking, when the faucet angle changes, both the hot and cold water flow rates change in tandem. Changes in either the hot or cold water flow rate can be used to determine whether the faucet's mixed water state has changed. You can select either flow rate to determine whether the faucet's mixed water state has changed, as needed.

[0084] The faucet angle adjustment may be completed by maintaining a change duration greater than a duration threshold.

[0085] In this embodiment, a specific implementation method for determining whether the water mixing state of the faucet has changed is provided.

[0086] In specific implementation, the following formula is used to calculate the hot water target temperature:

[0087] TM=((Q1+Q2)*T3-A2*Q2*T2) / Q1*A1.

[0088] Wherein, TM represents the target hot water temperature, A1 represents the hot water correction coefficient, A2 represents the cold water correction coefficient, Q1 represents the hot water flow rate, Q2 represents the cold water flow rate, T2 represents the cold water temperature, and T3 represents the target outlet water temperature.

[0089] In this embodiment, a calculation formula for the target temperature of hot water is provided.

[0090] When implementing it, refer to Figure 5 , the control method further includes:

[0091] S21. Obtain correction coefficient measurement instruction.

[0092] S22. According to the correction coefficient measurement instruction, the working mode of the water heater is set to the correction coefficient measurement mode.

[0093] S23. Acquire two sets of measurement data for different set hot water temperatures and the same outlet water measurement temperature. The outlet water measurement temperature represents the temperature of the water coming out of the faucet as detected, and the set hot water temperature represents the target hot water temperature set by the user. Each set of measurement data includes: hot water flow rate, hot water temperature, cold water flow rate, and cold water temperature.

[0094] S24. Calculate a hot water correction coefficient and a cold water correction coefficient based on the outlet water measurement temperature and the two sets of measurement data.

[0095] Among them, since the hot water correction coefficient and the cold water correction coefficient are related to the thickness of the water pipe, water quality, etc., the corresponding hot water correction coefficient and cold water correction coefficient are different after each water heater is installed. After the installation and debugging personnel install the water heater, they need to set the working mode of the water heater to the correction coefficient measurement mode to determine the hot water correction coefficient and the cold water correction coefficient.

[0096] In the correction coefficient measurement mode, the installation and commissioning personnel set the set hot water temperature (for example, 40 degrees Celsius) and manually adjust the faucet angle to stabilize the water outlet temperature at a measured outlet temperature (for example, 20 degrees Celsius), obtaining a set of measurement data. Then, they set a different set hot water temperature (for example, 30 degrees Celsius) and manually adjust the faucet angle to stabilize the water outlet temperature at the same measured outlet temperature (the same as above, 20 degrees Celsius), obtaining another set of measurement data.

[0097] The set hot water temperatures corresponding to these two sets of measurement data are different, so the corresponding measured hot water temperatures must be different, that is, the two sets of measurement data are different from each other, and the hot water correction coefficient and the cold water correction coefficient can be solved.

[0098] In this embodiment, a method for determining a hot water correction coefficient and a cold water correction coefficient is provided. The obtained hot water correction coefficient and cold water correction coefficient are consistent with the actual installation situation of the water heater, and can be used to determine the target water outlet temperature in the warm water outlet mode. The measurement data obtained by actual measurement ensures the accuracy of the determined hot water correction coefficient and the cold water correction coefficient, thereby ensuring the accuracy of the hot water target temperature, so that the water outlet temperature of the faucet meets the user's expectations, and adjusting the water temperature takes less time, saves water, is simple to operate, and improves the user experience.

[0099] In specific implementation, the following formula is used to calculate the hot water correction coefficient and the cold water correction coefficient:

[0100] A1=(Q11*Q22*T22+Q21*Q22*T22-Q12*Q21*T21-Q22*Q21*T21)*TA /

[0101] (Q11*T11*Q22*T22-Q12*T12*Q21*T21).

[0102] A2=(Q11*Q12*T12+Q21*Q12*T12-Q12*Q11*T11-Q22*Q11*T11)*TA /

[0103] (Q21*T21*Q12*T12-Q22*T22*Q11*T11).

[0104] Wherein, A1 represents the hot water correction coefficient, A2 represents the cold water correction coefficient, TA represents the outlet water measurement temperature, Q1 represents the hot water flow rate, T1 represents the hot water temperature, Q2 represents the cold water flow rate, T2 represents the cold water temperature, Q11, T11, Q21, and T21 represent the hot water flow rate, hot water temperature, cold water flow rate, and cold water temperature in one set of measurement data, respectively, and Q12, T12, Q22, and T22 represent the hot water flow rate, hot water temperature, cold water flow rate, and cold water temperature in another set of measurement data, respectively.

[0105] In this embodiment, calculation formulas for the hot water correction coefficient and the cold water correction coefficient in the correction coefficient measurement mode are provided.

[0106] In specific implementation, the control method also includes:

[0107] Exit the current operating mode of the water heater.

[0108] Each working mode of the water heater can realize a specific function. When the function is no longer needed, the current working mode of the water heater can be switched to another working mode.

[0109] For example, after calculating the hot water correction coefficient and the cold water correction coefficient in the correction coefficient determination mode, the working mode can be set to the warm water mode so that the water output from the faucet can be maintained at the constant temperature desired by the user without the user having to manually adjust the faucet.

[0110] In this embodiment, the current working mode of the water heater can be exited and set to another working mode.

[0111] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A method for controlling a water heater, characterized in that: The water heater includes a heat exchanger, a hot water flow sensor, a hot water temperature sensor, a cold water flow sensor and a cold water temperature sensor. The water outlet of the heat exchanger is connected to the hot water inlet of an external faucet. The hot water flow sensor is arranged at the water inlet of the heat exchanger, the hot water temperature sensor is arranged at the water outlet of the heat exchanger, and the cold water flow sensor and the cold water temperature sensor are arranged at the cold water inlet of the faucet. The control method includes: Get the target water outlet temperature; obtaining the hot water flow rate detected by the hot water flow sensor, the cold water flow rate detected by the cold water flow sensor, and the cold water temperature detected by the cold water temperature sensor; The hot water target temperature is calculated according to the target outlet water temperature, the hot water flow rate, the cold water flow rate, the cold water temperature, and the hot water correction coefficient and the cold water correction coefficient in accordance with the law of conservation of heat; wherein the hot water correction coefficient and the cold water correction coefficient are determined based on two different sets of measurement data; controlling the heat exchanger according to the hot water target temperature and the current hot water temperature detected by the hot water temperature sensor so that the hot water temperature is equal to the hot water target temperature; The control method further includes: Get the correction coefficient measurement instruction; According to the correction coefficient determination instruction, the working mode of the water heater is set to a correction coefficient determination mode; Obtaining two sets of measurement data with different set hot water temperatures and the same measured water outlet temperature; wherein the measured water outlet temperature represents the detected temperature of the water outlet from the faucet, and the set hot water temperature represents the target value of the hot water temperature set by the user, and each set of measurement data includes: the hot water flow rate, the hot water temperature, the cold water flow rate, and the cold water temperature; The hot water correction coefficient and the cold water correction coefficient are calculated based on the outlet water measurement temperature and the two sets of measurement data.

2. The water heater control method according to claim 1, wherein: The obtaining of the target outlet water temperature includes: Get warm water setting instructions; According to the warm water outlet setting instruction, the working mode of the water heater is set to the warm water outlet mode, and the target water outlet temperature is set.

3. The water heater control method according to claim 2, wherein: The warm water outlet setting instruction includes a set temperature value input by the user; The setting of the target outlet water temperature includes: The target outlet water temperature is set as the set temperature value.

4. The water heater control method according to claim 1, wherein: The control method further includes: Determining whether the water mixing state of the faucet has changed; If so, the hot water target temperature is recalculated.

5. The water heater control method according to claim 4, wherein: The determining whether the mixed water state of the faucet has changed includes: It is determined whether the change in the hot water flow rate is greater than a flow rate threshold.

6. The water heater control method according to claim 4, wherein: The determining whether the mixed water state of the faucet has changed includes: It is determined whether the change in the hot water flow is greater than a flow threshold and whether the time duration for which the change is maintained is greater than a time duration threshold.

7. The water heater control method according to claim 1, wherein: The hot water target temperature is calculated using the following formula: TM=((Q1+Q2)*T3-A2*Q2*T2) / Q1*A1; Wherein, TM represents the hot water target temperature, A1 represents the hot water correction coefficient, A2 represents the cold water correction coefficient, Q1 represents the hot water flow rate, Q2 represents the cold water flow rate, T2 represents the cold water temperature, and T3 represents the target water outlet temperature.

8. The water heater control method according to claim 1, wherein: The hot water correction coefficient and the cold water correction coefficient are calculated using the following formula: A1=(Q11*Q22*T22+Q21*Q22*T22-Q12*Q21*T21-Q22*Q21*T21)*TA / (Q11*T11*Q22*T22-Q12*T12*Q21*T21); A2=(Q11*Q12*T12+Q21*Q12*T12-Q12*Q11*T11-Q22*Q11*T11)*TA / (Q21*T21*Q12*T12-Q22*T22*Q11*T11); Among them, A1 represents the hot water correction coefficient, A2 represents the cold water correction coefficient, TA represents the outlet water measurement temperature, Q1 represents the hot water flow rate, T1 represents the hot water temperature, Q2 represents the cold water flow rate, T2 represents the cold water temperature, Q11, T11, Q21 and T21 respectively represent the hot water flow rate, hot water temperature, cold water flow rate and cold water temperature in one set of the measurement data, and Q12, T12, Q22 and T22 respectively represent the hot water flow rate, hot water temperature, cold water flow rate and cold water temperature in another set of the measurement data.

9. The water heater control method according to claim 8, wherein: The control method further includes: Exit the current operating mode of the water heater.

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